JPS5914757B

A light emitting display array which has a plurality of circuit lines in spaced apart relation to form a plurality of non-connected junctures across each of which is connected a light-emitting circuit which is selectively activated between stable ON and stable OFF conditions to form a lighted display pattern. Each of the light-emitting circuits includes a light-emitting element connected in circuit with a non-volatile semi-conductor memory threshold switching device capable of being selectively activated between high resistance current blocking and low resistance current conducting conditions which remain permanently in the semiconductor material forming the memory threshold switching device even when power is removed therefrom or the polarity reversed. Where there exist a great difference in impedence between the moemory threshold switching device used and the particular light-emitting device connected thereto, there is provided a bridge circuit arrangement to compensate for such differences, and which includes threshold isolation means to prevent address signal information from activating undesired light emitting circuits. In the case where threshold isolation means is used it can take the form of a neon lamp or a gallium arsenide diode or the like and function as both the isolation means and the light emitting element. A display pattern can be formed on the display array either with or without operating potential applied thereto and the display array can be stored for indefinite periods of time without affecting the condition of the display pattern formed on the array.